Machine for bending tubes.



P. BRANTIGAM' MACHINE FOR BENDING TUBES.

APPLICATION FILED SEPT. 1 6, 1911.

Patented Dec. 17, 1912.

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To all whom it may concern:

Be it known 'that I, FREDERICK BRANT!- GAM, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Machines for Bending Tubes, of which tion and operation of my novel tube bending machine; a tube having been ihserted, but the bending operation not having commenced; Fig. 2, a transverse section on the line 22 in Fig. 1 looking in the direction of the arrows, no tube being shown; Fig. 3,

a sectional view corresponding-with Fig. 1 showing the manner in which the bending roll is swung in an arc of a. circle to produce the required bend in a tube; Fig. 4, a similar view illustrating a modification in the details of construction; Fig. 5, a transverse section on the line 55 in Fig. 4 lookin in the direction of the arrows; and Fig. 6 1s a.

fixed in the framework. I The upper guide roll is placed out of vertical alinement with the lower ide roll and inward therefrom. Tubes are ent by forcing them through the guide rolls and into engagement with the bending roll' which is simu 'taneouslycaused to. swing in an arc of a circle, thereb bending the tube in a curve of any desire radius" within the limits-of the machine.- The-tubes are forced throu h the machine in any suitable manner as by. piston-15 operated by hydraulic or pneumatic ower.

In the form illustra in Figs. 1, 2 and a 1 is a 1on5 gitudinalsection illustrating the construc Specification-0110mm Patent. 1912. Application filed Qeptember 19,1911.

gerial No. 649,725.

the swinging bending i011 carried by a rod 16 which is'suspended within the framework from an upper cross rod 17, by means of ropes, wire cables or chains indicated by 18. Rod 16 upon which the swinging bending roll is mounted is connected by means of links 19 with a cross head 20 ri dly secured to a sliding rod 21, the rear end of which is connected to a piston 22, the forward end thereof extending throu h and being guided and supported by the ramework. 23 and 24 denote cylinders in which pistons 15 and 22 respectively reciprocate. I have shown a supply pipe 25, having acontrolling valve 26 and branch pipes. 27 and 28 leading to the respective cylinders. 29 denotes an adjustable stop on rod 21 which is adapted toengage the framework and limit the forward movement of the rod and consequently the oscillation of the swinging bending roll The are of movement of the swinging bending roll, in this form, means of an' adjustable fulcrum 30 which is adapted-to be moved vertically in slots 31 in the side pieces of the framework and to be locked in position by nuts 32 engaging the fulcrum, in the present instance a rod, and bearing against the side ieces of the framework. I have shown in crum 30 as having mounted thereon rollers 33, upon which the ropes, cables or chains bear.

In the form illustrated in Figs. 4 and 5 the swinging bending roll is suspended from the fulcrum 30 and the latter is suspended is determined by.

from the framework. In the present in-.-

stance I have shown the fulcrum as provided with a central hub 34 from which a rod 35 extends upward through the top cross piece of the framework. The upper end of this red is threaded and said rodjand fulcrum are locked at any required adjustment by means of a nut 36 engaging rod 35 and bearing upon the top cross piece of the framework. Rod 16 upon which the swinging bending roll is mounted to rotate is carried by links 37 the upper ends of whichpass freely throu h yokes 38 which oscillate on the fulcrum, t e upper ends of saidlinks being threaded and engaged by nuts 39 which bear upon the yokes and are shown as locked in place by .set nuts 40. This adjustment may be used in cooperation with the adjustment of rod 35 indetermining the aria1 of movement of the swinging bending r0 Instead of slots 31 the side pieces of the to the framework may be provided with a plu-L rality of holes 41, as shown in Fig. 6, and the fulcrum instead of bein moved vertically in said slots may be p aced in corresponding holes 41 where it will be rigidly held in place.

The operation will be obvious from the description of the machine. In either form of the invention, tubes can be bent in curves of any required radius within the capacit of the machine by adjustment of the fu crum relatively to the'bending roll.

In the form illustrated in Figs. 4 and 5 in addition to providing means for adjust? ing the fulcrum vertically, I provide in addition means for adjusting the bending roll toward and from the fulcrum rod.

It will be noted that in all of the forms of my invention illustrated in the drawing, the bending is carried by a freely swinging support eccentrically mounted with relation ide rollers.

Havmg thus described my invention I claim:

1. A machine of the character described comprising guide rolls, a swinging bending roll, a support for said bending roll, a variable fulcrum intermediate said support and bending roll and about which said roll will swlilng, and means for swinging said bending ro 2. A machine of the character described comprising a frame, guide rolls mounted therein, a swinging bending roll, a support in said frame for said bending roll, a fulcrum adjustabl .mounted in said framework intermediate 0 said support and said bending roll and about which said bending roll will swing, and means for swinging said bending r01 I 3. A machine of the character described comprising a frame provided with slotted side pieces, guide rolls mounted in said frame, a swinging bending roll, a support in said frame for said bendin roll, a fulcrum adjustably mounted in sand slots intermediate of said support and said bending roll and about which said bending roll will swing, and means for swinging said-bending roll.

4. A machine of the character described comprising guide rolls, a swinging bending roll, a support for said bending roll, a variable fulcrum intermediate said support and bending roll and about which said roll will swing, a longitudinally movable rod, and

connections intermediate of said rod and Locum said bending roll, whereby movement of said rod causes said bending roll to swing in an arc of a circle.

5. A machine of the character described comprising guide rolls, a bending roll, a rod on which said roll is mounted, sus endin cables to which said rod is connecte an a just-able fulcrum ngaged by said cables and means for swinging the rod and bending roll in an arc o crum is the center.

6. A machine of the character described comprising guide rolls, a bending roll, eccentrically hung freely swinging cables for supporting said bending roll, a fulcrum arranged to engage said cables, and means for swinging the bending roll to bring the cables and fulcrum into engagement, whereb thebending roll is swung in an arc of a circle with the fulcrum as the center.

7. A machine of the character described comprising guide rolls, a bending roll, cables bywhich the bending roll is suspended,a fulcrum engaged by said cables, 'a reciprocating rod and connections between said rod and the bending roll whereby the latter is swung in an arc of a circle.

8. A machine of the character described comprising guide rolls, a bending roll, cables by which the bending roll fulcrum engaged by said cables, a reciprothe bending roll, for the pur ose set forth, and a stop for limiting the orward movement of the rod.

9. In a machine of the character described, the combination with guide rolls, 'a bending roll and cables by which the bending roll is suspended, of a fulcrum engaged by said cables, a reciprocating rod and con-- is suspended, a

eating rod, connections between said rod and nections between-said rod and the bending roll.

10. In a machine of the character described, the combination with guide rolls, a suspended bending roll and a fulcrum from which said roll swings in an arc of a circle, of a longitudinally moving. rod connections between said rod and the bending roll and a stop for limiting the forward movement of said rod.

In testimony whereof I aflix my signature in presence of two witnesses.

FREDERICK BRANTIGAM.

Witnesses:

J OHN F. NEWMAN, q THOMAS L. HEALY.

Correction in tetters Patent No -1,047,612.

It is hereby certified that in Letters Patent No. 1,047,612, granted December 17 1912, for an improvement in Machines for Bending Tubes, the name of the patentee was;erroneously written and printed as Frederick Brantigam, whereas said name should have been written and printed Frederick Bmutz'gam; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 28th day of January, A. D., 1913;

' c. 0. BILLINGS,

Acti/ng Oemmissioner of Patents.

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